﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo01
{
    class Square:Shape
    {
        public Square(int sideLen) : base(sideLen)
        {
           
            Console.WriteLine("正方形面积为：{0}", sideLen * sideLen );
        }
    }
}
